A Study on Resilient Modulus and Dynamic Creep of Asphalt Mixes Reinforced With Polyolefin - Aramid FORTA Composite Fibers

Due to the high production costs of asphalt mixes, utilization of additives in asphalt mixtures to enhance the durability and performance is necessary. In this study, different percentages of Polyolefin – Aramid FORTA composite fibers were added to the asphalt mix and the resilient modulus testing at two different temperatures and dynamic creep test with two different loading waveforms was carried out. The results indicate that adding fiber increases the stiffness and resistance to rutting of asphalt mixtures. By adding 1.5 kg fiber per ton of asphalt concrete, the resilient modulus of asphalt concrete increased 62% and 242% at temperature of 25 o C and 40o C, respectively. So it is evident that increasing of stiffness in case of fiber reinforced asphalt mixtures at higher temperature (40 ° C) is greater than that at the average temperature (25° C). It was also observed that an increase of 1.5 kg of fibers to the mix causes the flow number to be increased to double of flow number of unmodified asphalt mixture. In addition, comparison of dynamic creep curves under haversine and square loading waveform shows that the flow number and slope of creep curve at second stage are double and half of these values under square loading waveform at the same loading frequency.